| Acronym | Meaning |
| EERU | Environmental Emergency Response Unit |
| EESI | Environment And Energy Study Institute |
| EESL | Environmental Ecological And Support Laboratory |
| EESOP | Electronegativity Equalization With S-orbital Participation |
| EET | Epoxyeicosatrienoic Acid |
| EET | Electronic Energy Transfer |
| EETFC | Environmental Effects |
| EETU | Environmental Education And Training Unit |
| EEW | Epoxy Equivalent Weight |
| EEXAPS | Electron Excited X-ray Appearance Potential Spectroscopy |
| EF | Emission Factor |
| EFA | Envelope Function (i.e. |
| EFA | Essential Fatty Acid |
| EFA | Evolving Factor Analysis |
| EFB | European Federation Of Biotechnology |
| EFB | Empty Fruit Bunch |
| EFC | European Federation Of Corrosion |
| EFCE | European Federation Of Chemical Engineers |
| EFD | Explicit Finite Difference |
| EFFF | Electric Field-flow Fractionation |
| EFFF | Energy Factored Force Field |
| EFG | Edge-defined Film Growth (of Semiconductors |
| EFG | Electric Field Gradient |
| EFG GTO | Electric Field Gradient Gaussian-type Orbital |
| EFGF | Electric Field Gradient Focusing |
| EFH | Extended Fenske-Hall (LCAO MO Method) |
| EFIG | Emission Factor Inventory Grouppar |
| EFIN | Environmental Financing Information Network |
| EFISH | Elec. Field-induced 2nd-harmonic Generation |
| EFISPS | Electric Field Induced Surface Photovoltage Spectroscopy |
| EFLE | Enhanced-fluidity Liquid Extraction |
| EFM | Electric Force Microscopy |
| EFOCS | Evanescent Fiber Optic Chemical Sensors |
| EFOIA | Electronic Freedom Of Information Act |
| EFP | Effective Fragment Potential Method |
| EFP | Explosively Formed Projectile |
| EFPD | Effective Full Power Day |
| EFPI | Extrinsic Fabry-Perot Interferometer Sensor |
| EFPVN | Eastern Fine Particle And Visibility Network |
| EFRTS | External-floating-roof Tanks |
| EFS | Elec. Field Stimulation |
| EFS | Event-free Survival |
| EFST | Electrodeposition Frequency Shift Titrimetry |
| EFTA | European Free Trade Association |
| EFTC | European Fluorocarbon Technical Committee |
| EFTEM | Energy-filtering Transmission Electron Microscopy |
| EFTIR | Emission Fourier Transform Infrared Spectroscopy |
| EFV | Electric-field-variant Function (in CI Method) |
| EFV GTO | Electric-field-variant Gaussian-type Orbital |
| EFV STO | Electric-field-variant Slater-type Orbital |